Shape Memory Polymers for Body Motion Energy Harvesting and Self-Powered Mechanosensing

2018 ◽  
Vol 30 (8) ◽  
pp. 1705195 ◽  
Author(s):  
Ruiyuan Liu ◽  
Xiao Kuang ◽  
Jianan Deng ◽  
Yi-Cheng Wang ◽  
Aurelia C. Wang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Shape Memory ◽  
Shape Memory Polymers ◽  
Body Motion ◽  
Motion Energy ◽  
Self Powered

scholarly journals Electrode and electrolyte configurations for low frequency motion energy harvesting based on reverse electrowetting

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pashupati R. Adhikari ◽  
Nishat T. Tasneem ◽  
Russell C. Reid ◽  
Ifana Mahbub
Keyword(s):  
Energy Harvesting ◽  
Bias Voltage ◽  
Energy Harvester ◽  
Superior Performance ◽  
Maximum Output ◽  
Electrowetting On Dielectric ◽  
External Bias ◽  
Motion Energy ◽  
Ac Current ◽  
Self Powered

AbstractIncreasing demand for self-powered wearable sensors has spurred an urgent need to develop energy harvesting systems that can reliably and sufficiently power these devices. Within the last decade, reverse electrowetting-on-dielectric (REWOD)-based mechanical motion energy harvesting has been developed, where an electrolyte is modulated (repeatedly squeezed) between two dissimilar electrodes under an externally applied mechanical force to generate an AC current. In this work, we explored various combinations of electrolyte concentrations, dielectrics, and dielectric thicknesses to generate maximum output power employing REWOD energy harvester. With the objective of implementing a fully self-powered wearable sensor, a “zero applied-bias-voltage” approach was adopted. Three different concentrations of sodium chloride aqueous solutions (NaCl-0.1 M, NaCl-0.5 M, and NaCl-1.0 M) were used as electrolytes. Likewise, electrodes were fabricated with three different dielectric thicknesses (100 nm, 150 nm, and 200 nm) of Al2O3 and SiO2 with an additional layer of CYTOP for surface hydrophobicity. The REWOD energy harvester and its electrode–electrolyte layers were modeled using lumped components that include a resistor, a capacitor, and a current source representing the harvester. Without using any external bias voltage, AC current generation with a power density of 53.3 nW/cm2 was demonstrated at an external excitation frequency of 3 Hz with an optimal external load. The experimental results were analytically verified using the derived theoretical model. Superior performance of the harvester in terms of the figure-of-merit comparing previously reported works is demonstrated. The novelty of this work lies in the combination of an analytical modeling method and experimental validation that together can be used to increase the REWOD harvested power extensively without requiring any external bias voltage.

Harvesting Energy of Body Motion Through Single Electrode Based Self-Powered Triboelectric Nanogenerator

2019 ◽  
Vol 14 (11) ◽  
pp. 1572-1581 ◽  
Author(s):  
Shamsuddin ◽  
Saeed Ahmed Khan ◽  
Ahmed Ali ◽  
Abdul Qadir Rahimoon ◽  
Palwasha Jalalzai
Keyword(s):  
Energy Harvesting ◽  
Human Skin ◽  
Mechanical Energy ◽  
Short Circuit ◽  
Copper Acetate ◽  
Body Motion ◽  
Triboelectric Nanogenerator ◽  
Wearable Electronics ◽  
Silicon Rubber ◽  
Self Powered

A self-powered mechanical energy harvesting system consists of the storage system and the energy scavenging TENG. Triboelectric nanogenerator includes a system which integrates a self-powered sensor and the power generator, this triboelectric nanogenerator has the potential to be used in a modern wearable electronic TENG. It has been reported that triboelectric nanogenerator working under complicated deformation like bending, stretching and twisting brings the main problem. Here we have fabricated the shape adaptive Triboelectric nanogenerator which solves all the deformation issues and can harvest the mechanical energy through human body motion in any deformation, the fabricated TENG is a self-powered sensor which can sense the different human activities and can monitor the health issues, the TENG stores the energy directly to the capacitor for powering the wearable electronics. A human skin based triboelectric nanogenerator was designed from the silicon rubber and the copper acetate-II used as the electrode, which makes the TENG flexible self-powered sensor, it can be stretched up to 200%. The stretchable nature and the flexibility of the human skin based silicon rubber triboelectric nanogenerator makes it the promising flexible and shape-adaptive energy harvesting TENG. The fabricated TENG generated the open circuit voltage 70 V and the short circuit current 11 μA and delivered the power 55 μW at the load of 80 MΩ. 42 LEDs were powered directly from the TENG. The fabricated TENG has human skin tactile property which does not harm the human skin while using it multiple times. The layer of copper acetate is completely coated with silicone rubber. The fabricated TENG is flexible, biocompatible and cost effective.

Piezoelectric-Driven Self-Powered Patterned Electrochromic Supercapacitor for Human Motion Energy Harvesting

2018 ◽  
Vol 7 (1) ◽  
pp. 1745-1752 ◽  
Author(s):  
Zhenzhu He ◽  
Bingbing Gao ◽  
Tong Li ◽  
Junlong Liao ◽  
Bing Liu ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Human Motion ◽  
Motion Energy ◽  
Self Powered

scholarly journals Measurements of Generated Energy/Electrical Quantities from Locomotion Activities Using Piezoelectric Wearable Sensors for Body Motion Energy Harvesting

Sensors ◽  
2016 ◽  
Vol 16 (4) ◽  
pp. 524 ◽  
Author(s):  
Antonino Proto ◽  
Marek Penhaker ◽  
Daniele Bibbo ◽  
David Vala ◽  
Silvia Conforto ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Wearable Sensors ◽  
Body Motion ◽  
Motion Energy
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